Adjustable safety utility knife



FIG. 1 is one side elevational view of an adjustable safety utility knife showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is the opposite side elevational view thereof;

FIG. 5 is a front end elevational view thereof; and,

FIG. 6 is a rear end elevational view thereof. 

The ornamental design for an adjustable safety utility knife, as shown. 